Regular exercise can radically cut the risk of dementia, scientists have
found, as health chiefs from the world’s richest countries converge on
Britain to fight “the 21st-century plague”.

David Cameron has made it a personal mission to tackle the looming crisis as
he prepares to host a G8 conference on the disease tomorrow.

Experts urged him to tell the public that keeping fit and eating well rather
than new drugs will bring greatest progress in the fight against the
condition. Middle-aged people must take responsibility for preventing the
disease, rather than waiting for a cure, they said. Living healthily can